<template>
    <div :class="className" :style="{ height: height, width: width }" />
</template>

<script>
import echarts from 'echarts';

require('echarts/theme/macarons'); // echarts theme
import { debounce } from '@/utils';

export default {
    props: {
        className: {
            type: String,
            default: 'chart',
        },
        width: {
            type: String,
            default: '100%',
        },
        height: {
            type: String,
            default: '300px',
        },
    },
    data() {
        return {
            chart: null,
        };
    },
    mounted() {
        this.initChart();
        this.__resizeHandler = debounce(() => {
            if (this.chart) {
                this.chart.resize();
            }
        }, 100);
        window.addEventListener('resize', this.__resizeHandler);
    },
    beforeDestroy() {
        if (!this.chart) {
            return;
        }
        window.removeEventListener('resize', this.__resizeHandler);
        this.chart.dispose();
        this.chart = null;
    },
    methods: {
        initChart() {
            this.chart = echarts.init(this.$el, 'macarons');

            this.chart.setOption({
                title: {
                    text: '漏斗图',
                    subtext: '纯属虚构',
                },
                tooltip: {
                    trigger: 'item',
                    formatter: '{a} <br/>{b} : {c}%',
                },
                toolbox: {
                    feature: {
                        dataView: { readOnly: false },
                        restore: {},
                        saveAsImage: {},
                    },
                },
                legend: {
                    data: ['展现', '点击', '访问', '咨询', '订单'],
                },
                calculable: true,
                series: [
                    {
                        name: '漏斗图',
                        type: 'funnel',
                        left: '10%',
                        top: 60,
                        bottom: 60,
                        width: '80%',
                        // height: {totalHeight} - y - y2,
                        min: 0,
                        max: 100,
                        minSize: '0%',
                        maxSize: '100%',
                        sort: 'descending',
                        gap: 2,
                        label: {
                            show: true,
                            position: 'inside',
                        },
                        labelLine: {
                            length: 10,
                            lineStyle: {
                                width: 1,
                                type: 'solid',
                            },
                        },
                        itemStyle: {
                            borderColor: '#fff',
                            borderWidth: 1,
                        },
                        emphasis: {
                            label: {
                                fontSize: 20,
                            },
                        },
                        data: [
                            { value: 60, name: '访问' },
                            { value: 40, name: '咨询' },
                            { value: 20, name: '订单' },
                            { value: 80, name: '点击' },
                            { value: 100, name: '展现' },
                        ],
                    },
                ],
            });
        },
    },
};
</script>
